Do roots secrete? ‘Brugman’ a botanist proved from his experiments that the roots not only absorb fluid from soil, but returns a portion of their peculiar secretions back into it.
We can see such instances in plants like apple where a single apple crop for 4 or 5 years continuously in the same soil, that fail to produce fruits. It will not give proper yield even if you use lot of fertilizers.

Do you think there is any relation between reduction in yielding and root secretions?

Why do we get peculiar smell when you shift the potted plants?

Excretion Vs Secretion

Excretion and secretion are the same in nature. Since both are involved in passage or movement of materials. Both processes move and eliminate unwanted components from the body.
Excretion is the removal of materials from a living being, while secretion is movement of material from one point to other point. So secretion is active while excretion is passive in nature. Humans excrete materials such as tears, urine, Carbon dioxide, and sweat while secretion on other hand, includes enzymes, hormones, and saliva. In plants too we find excretion through roots into its surroundings and falling off leaves and bark. Secretions occur in the plant body in form of latex, resins, gums etc.

What We Have Learn:-
-->Due to metabolism several harmful excretory products are formed and process of removing toxic waste from the body is called execretion.

-->The human excretory system comprises a pair of kidneys, a pair of ureters, urinary bladder, urethra.

-->Each kidney is composed of approximately 1.3 to 1.8 millions of uriniferous tubules or nephrons, which are structural and functional units of kidney.

-->A nephron comprises glomerulus,bowman’s capsule, proximal convoluted tubule (PCT), Henle’s loop, Distal convoluted tubule (DCT) and collecting tubule.

-->Formation of urine involves four stages. 1) Glomerular filteration, 2) Tubular Reabsorption, 3) Tubular Secretion, 4) Concentration of Urine.